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>Video for Linux Two API Specification: Revision 0.24</TH
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><H1
><A
NAME="VIDIOC-G-STD"
></A
>ioctl VIDIOC_G_STD, VIDIOC_S_STD</H1
><DIV
CLASS="REFNAMEDIV"
><A
NAME="AEN12269"
></A
><H2
>Name</H2
>VIDIOC_G_STD, VIDIOC_S_STD&nbsp;--&nbsp;Query or select the video standard of the current input</DIV
><DIV
CLASS="REFSYNOPSISDIV"
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NAME="AEN12273"
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><H2
>Synopsis</H2
><DIV
CLASS="FUNCSYNOPSIS"
><P
></P
><A
NAME="AEN12274"
></A
><P
><CODE
><CODE
CLASS="FUNCDEF"
>int ioctl</CODE
>(int fd, int request, v4l2_std_id
*argp);</CODE
></P
><P
></P
></DIV
><DIV
CLASS="FUNCSYNOPSIS"
><P
></P
><A
NAME="AEN12284"
></A
><P
><CODE
><CODE
CLASS="FUNCDEF"
>int ioctl</CODE
>(int fd, int request, const v4l2_std_id
*argp);</CODE
></P
><P
></P
></DIV
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN12294"
></A
><H2
>Arguments</H2
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
><CODE
CLASS="PARAMETER"
>fd</CODE
></DT
><DD
><P
>File descriptor returned by <A
HREF="r14090.htm"
><CODE
CLASS="FUNCTION"
>open()</CODE
></A
>.</P
></DD
><DT
><CODE
CLASS="PARAMETER"
>request</CODE
></DT
><DD
><P
>VIDIOC_G_STD, VIDIOC_S_STD</P
></DD
><DT
><CODE
CLASS="PARAMETER"
>argp</CODE
></DT
><DD
><P
></P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN12314"
></A
><H2
>Description</H2
><P
>To query and select the current video standard applications
use the <CODE
CLASS="CONSTANT"
>VIDIOC_G_STD</CODE
> and <CODE
CLASS="CONSTANT"
>VIDIOC_S_STD</CODE
> ioctls which take a pointer to a
<A
HREF="r9288.htm#V4L2-STD-ID"
>v4l2_std_id</A
> type as argument. <CODE
CLASS="CONSTANT"
>VIDIOC_G_STD</CODE
> can
return a single flag or a set of flags as in struct&nbsp;<A
HREF="r9288.htm#V4L2-STANDARD"
>v4l2_standard</A
> field
<CODE
CLASS="STRUCTFIELD"
>id</CODE
>. The flags must be unambiguous such
that they appear in only one enumerated <CODE
CLASS="STRUCTNAME"
>v4l2_standard</CODE
> structure.</P
><P
><CODE
CLASS="CONSTANT"
>VIDIOC_S_STD</CODE
> accepts one or more
flags, being a write-only ioctl it does not return the actual new standard as
<CODE
CLASS="CONSTANT"
>VIDIOC_G_STD</CODE
> does. When no flags are given or
the current input does not support the requested standard the driver
returns an <SPAN
CLASS="ERRORCODE"
>EINVAL</SPAN
> error code. When the standard set is ambiguous drivers may
return <SPAN
CLASS="ERRORCODE"
>EINVAL</SPAN
> or choose any of the requested
standards.</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN12329"
></A
><H2
>Return Value</H2
><P
>On success <SPAN
CLASS="RETURNVALUE"
>0</SPAN
> is returned, on error <SPAN
CLASS="RETURNVALUE"
>-1</SPAN
> and the <CODE
CLASS="VARNAME"
>errno</CODE
> variable is set appropriately:</P
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
><SPAN
CLASS="ERRORCODE"
>EINVAL</SPAN
></DT
><DD
><P
>This ioctl is not supported, or the
<CODE
CLASS="CONSTANT"
>VIDIOC_S_STD</CODE
> parameter was unsuitable.</P
></DD
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